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The period of a geostationary (synchronous) satellite orbiting the earth over the equator la

A. 16 hours

B. 12 hours

C. 20 hours

D. 24 hours

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  17. Nuclear fusion is a process in which
  18. The audible range of a normal human ear is frequencies ranging from
  19. One can be recognised by his voice alone due to the factor of
  20. In the electrical circuit of a house the fuse acts as
  21. In the fuse of an electrical installation blows out
  22. The red colour of the setting sun is due to
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